DNA Replication: Accurate Copying of the DNA Strand during Replication

If the DNA sequence ATGCTCAT was found to have the complimentary strand TACGGGTA, which of the following is possible?Select one:A. The cell correctly copied the DNA strand during replication.B. There was an error during DNA replication.C. There was an error during transcription where the incorrect codon on the tRNA molecule.D. There was an error during translation where the incorrect nucleotide was brought by the mRNA.

The correct answer is A

The correct answer is A. The cell correctly copied the DNA strand during replication.

When DNA is replicated, complementary base pairing occurs, which means that adenine (A) pairs with thymine (T) and guanine (G) pairs with cytosine (C). In the given DNA sequence ATGCTCAT, the complementary sequence would be TACGGGTA. The pairing between A and T, G and C, C and G, and T and A is correctly maintained in the complementary strand, indicating that the DNA was accurately copied during replication.

Option B, “There was an error during DNA replication,” is incorrect because the complementary strand demonstrates the accurate replication of the original DNA sequence.

Option C, “There was an error during transcription where the incorrect codon on the tRNA molecule,” is irrelevant since transcription is not mentioned in the given information. Transcription involves the synthesis of mRNA from a DNA template.

Option D, “There was an error during translation where the incorrect nucleotide was brought by the mRNA,” is also irrelevant since translation is not mentioned either. Translation occurs after transcription and involves the synthesis of a polypeptide chain using the mRNA template and tRNA molecules with specific amino acids.

In conclusion, the correct answer is A, indicating that the cell correctly copied the DNA strand during replication.

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